fixed ci page

Author: ThomasTejedor

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - users: actions/checkout@v3
+    - uses: actions/checkout@v3
     - name: Login Dockerhub 
       env:
         DOCKER_USERNAME: ${{secrets.DOCKER_USERNAME}}